Instruction manual | Carrier 38YCX Heat Pump User Manual

38YCX—50 Hz
Heat Pump—Outdoor Section
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Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, or your distributor or
branch for information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories when
modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
IP24
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warnings or cautions attached to the unit. Consult local building
codes and the national electric codes for special installation
requirements.
Recognize safety information. This is the safety-alert symbol
.
When you see this symbol on the unit or in instructions and
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There
may be more than 1 disconnect switch. Lock out and tag
switch with a suitable warning label. Electrical shock can
cause personal injury or death.
INSTALLATION
Step 1—Check Equipment and Job Site
UNPACK UNIT — Move to final location. Remove carton taking
care not to damage unit.
INSPECT EQUIPMENT — File claim with shipping company
prior to installation if shipment is damaged or incomplete. Locate
unit rating plate on unit corner panel. (See Fig. 2.) It contains
information needed to properly install unit. Check rating plate to
be sure unit matches job specifications.
Step 2—Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 2
to determine base pan size and knockout hole location.
A97005
Fig. 1—Model 38YCX
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. (762mm)
clearance to service end of unit and 48 in. (1219mm) above unit.
For proper airflow, a 6-in. (152mm) clearance on 1 side of unit and
12 in. (305mm) on all remaining sides must be maintained.
Maintain a distance of 24 in. (610mm) between units. Position so
water, snow, or ice from roof or eaves cannot fall directly on unit.
On rooftop applications, locate unit at least 6 in. (152mm) above
roof surface. Place unit above a load-bearing wall and isolate unit
and tubing set from structure.
Arrange supporting members to adequately support unit and
minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Step 3—Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
In areas where prolonged freezing temperatures are encountered,
elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit. (See Fig. 3.)
Step 4—Replace Indoor AccuRater® Piston (if required)
Check indoor coil piston to see if it matches the required piston
shown on outdoor unit rating plate. (See Fig. 2.) If it does not
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 003-880
Printed in U.S.A.
Form 38YCX-C3SI
Pg 1
2-02
Replaces: 38YCX-C2SI
Tab 5a 5a
NOTES:
1. ALLOW 30″ CLEARANCE TO SERVICE END OF
UNIT, 48″ ABOVE UNIT, 6″ ON ONE SIDE, 12″
ON REMAINING SIDE, AND 24″ BETWEEN
UNITS FOR PROPER AIRFLOW.
2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS
55° F (UNLESS LOW AMBIENT CONTROL IS USED) MAX. 115° F.
3. MAXIMUM OUTDOOR OPERATING AMBIENT IN HEATING MODE IS 66° F.
4. SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT
MODEL NUMBER.
A
AIR DISCHARGE
AIR IN
AIR
DISCHARGE
FIELD POWER
SUPPLY CONN
7/8″ DIA HOLE WITH
1 1/8″ DIA KNOCKOUT
AND 1 3/8″ DIA KNOCKOUT
E
AIR
IN
AIR IN
G
B
AIR
DISCHARGE
FIELD CONTROL
SUPPLY CONN
7/8″ DIA HOLE
C
AIR IN
F DIA SUCTION LINE CONN
D
3/8″ DIA LIQUID LINE CONN
A97004
UNIT
SIZE
024
036
048
060
A/B
In.
22-1/2
30
30
30
C
mm
571.5
762.0
762.0
762.0
In.
3-11/16
6-1/2
6-1/2
6-1/2
D
mm
93.6
165.1
165.1
165.1
In.
18-1/8
23-1/2
23-1/2
23-1/2
E
mm
460.4
596.9
596.9
596.9
In.
14-3/8
20
20
20
F
mm
365.1
508.0
508.0
508.0
In.
5/8
3/4
7/8
7/8
G
mm
15.88
19.05
22.23
22.23
In.
33-15/16
39-15/16
33-15/16
33-15/16
mm
862.0
1014.4
862.0
862.0
Fig. 2—Unit Reference Drawing
match, replace indoor coil piston with piston shipped with outdoor
unit. The piston shipped with outdoor unit is correct for any
approved indoor coil combination.
Do not operate unit in the vicinity of toxic or flammable
material. Failure to follow this warning can result in personal
injury, fire, or death.
Remove indoor coil piston if unit is to be installed on system
with a TXV metering device.
Step 5—Make Piping Connections
Relieve pressure and recover all refrigerant before system
repair or final unit disposal to avoid personal injury or death.
Use all service ports and open all flow-control devices,
including solenoid valves.
SERVICE
ACCESS
A97006
Fig. 3—Accessory Heat Pump Feet
2
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters
UNIT SIZE
024
036
048
060
LIQUID
Connection Dia.
In.
mm
3/8
9.53
3/8
9.53
3/8
9.53
3/8
9.53
VAPOR
Tube Dia.
In.
mm
3/8
9.53
3/8
9.53
3/8
9.53
3/8
9.53
Connection
In.
5/8
3/4
7/8
7/8
DIia.
mm
15.88
19.05
22.23
22.23
Vapor Dia.
In.
mm
5/8
15.88
3/4
19.05
7/8
22.23
1-1/8
28.58
NOTES: 1. Tube diameters are for lengths up to 50 ft (15.24m). For tubing lengths greater than 50 ft (15.24m), consult Long-Line Application Guideline.
2. Do not apply capillary tube indoor coils to these units.
NOTE: Avoid contact between tubing and structure.
OUTDOOR WALL
To prevent compressor damage DO NOT bury more than 36
in. of refrigerant tubing. If ANY tubing is buried, provide 6
in. vertical rise at service valve.
INDOOR WALL
CAULK
To prevent damage to unit or service valves observe the
following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
LIQUID TUBE
VAPOR TUBE
INSULATION
THROUGH THE WALL
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 50 ft (15.24m),
consult Long-Line Application Guideline which is available from
your local distributor.
JOIST
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
INSULATION
VAPOR TUBE
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
INSTALLATION RECOMMENDATIONS
1. Locate unit away from windows.
1″ MIN
(25 mm)
2. Ensure that vapor and liquid tube diameters are appropriate to
capacity of unit. (See Table 1.)
LIQUID TUBE
SUSPENSION
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
A94330
4. Leave some slack between structure and unit to absorb
vibration.
Fig. 4—Piping Installation
5. When passing refrigerant tubes through the wall, seal opening
with RTV or other pliable silicon-based caulk. (See Fig. 4.)
PISTON BODY
6. Avoid direct tubing contact with water pipes, ductwork, floor
joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with a
rigid wire or strap which comes in direct contact with tubing.
(See Fig. 4.)
8. Ensure that tubing insulation is pliable and completely surrounds vapor tube.
PISTON
9. When necessary, use hangar straps which are 1 in. (25mm)
wide and conform to shape of tubing insulation. (See Fig. 4.)
PISTON RETAINER
10. Isolate hangar straps from insulation by using metal sleeves
bent to conform to shape of insulation.
SWEAT/FLARE ADAPTER
If refrigerant tubes or indoor coil is exposed to atmosphere, it must
be evacuated to 500 microns to eliminate contamination and
moisture in the system.
A94029
Fig. 5—Service Valve with Sweat Adapter Tube
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED
INDOOR UNIT — Outdoor unit contains correct system refrigerant charge for operation with indoor unit of same size when
connected by 15 ft (4.55m) of field-supplied or factory-accessory
tubing. Check refrigerant charge for maximum efficiency.
3
REFRIGERANT TUBING — Connect tubing to fittings on outdoor unit vapor and liquid service valves. (See Fig. 2 and 5.)
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes. Failure to follow this warning can result in an
electric shock, fire, or death.
SWEAT CONNECTION — Use refrigerant grade tubing. Service
valves are closed from factory and ready for brazing. After
wrapping service valve with a wet cloth, tubing set can be brazed
to service valve using either silver bearing or non-silver bearing
brazing material. Consult local code requirements. Refrigerant
tubing and indoor coil are now ready for leak testing. This check
should include all field and factory joints.
Step 6—Make Electrical Connections
NOTE: Use No. 18 AWG (American Wire Gage) color-coded,
insulated (35°C minimum) wires. If thermostat is located more
than 100 ft (30.5m) from unit (as measured along the control
voltage wires), use No. 16 AWG color-coded wires to avoid
excessive voltage drop.
To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
CONNECT CONTROL WIRING — Route 24-v control wires
through control wiring grommet and connect leads to control
wiring terminal board. (See Fig. 7.)
Use furnace transformer, fan coil transformer, or accessory transformer for control power, 24-v/40-va minimum.
NOTE: Use of available 24-v accessories may exceed the minimum 40-va power requirement. Determine total transformer loading and increase the transformer capacity or split the load with an
accessory transformer as required.
NOTE: The defrost timer is factory set for 90-minute cycles. The
timer can be field set for 30- and 50-minute cycles depending on
defrost conditions in your geographic location.
Step 7—Compressor Crankcase Heater
When equipped with a crankcase heater, energize heater a minimum of 24 hr before starting unit. To energize heater only, set
thermostat to OFF and close electrical disconnect to outdoor unit.
A crankcase heater is required if the refrigerant tubing is longer
than 50 ft.
Step 8—Install Electrical Accessories
Refer to the individual instructions packaged with the kits or
accessories when installing.
Step 9—Start-up and Check Charge
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
NOTE: Use copper wire only between disconnect switch and
unit.
NOTE: Install branch circuit disconnect per local codes to handle
unit starting current. Locate disconnect within sight from and
readily accessible from unit per local codes.
ROUTE GROUND AND POWER WIRES — Remove access
panel and control box cover to gain access to unit wiring. Extend
wires from disconnect through power wiring hole provided and
into unit control box. (See Fig. 2.) Size wires per local codes but
not smaller than minimum wire size shown on unit rating plate.
CONNECT GROUND AND POWER WIRES — Connect ground
wire to ground connection in control box for safety. Connect
power wiring to contactor as shown in Fig. 6.
DISCONNECT PER
IEC AND/OR
LOCAL CODES
FIELD POWER
WIRING
To prevent compressor damage or personal injury, observe
the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch
In scroll compressor applications:
• Dome temperatures may be hot.
CONTACTOR
L1
L2/N
L3
PE
L1
N FOR 1-PHASE ONLY
3-PHASE ONLY
L2/N
L3
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
• Back seating service valves are not equipped with Schrader
valves. Fully back seat (counter clockwise) valve stem before
removing gage port cap.
• Front seating service valves are equipped with Schrader
valves.
PE
GROUND
LUG
A96650
Fig. 6—Line Power Connections
4
THERMOSTAT
FB4ASX
FAN COIL
HEAT PUMP
R
R
R
G
G
C
C
W2
W2
THERMOSTAT
FB4ASX
FAN COIL
HEAT PUMP
R
R
R
G
G
C
C
C
C
W2
W2
W2
W2
E
E
E
L
L
BLU
ODTS
W3
O
O
O
O
Y
Y
Y
Y
SYSTEMS WITH ONE
OUTDOOR THERMOSTAT
SYSTEMS WITHOUT
OUTDOOR THERMOSTAT
A97053
A97054
THERMOSTAT
FB4ASX
FAN COIL
HEAT PUMP
R
R
R
G
G
C
C
W2
W2
L
W3
E
E
C
ODTS1
W2
BLU
VIO
ODTS2
O
O
Y
Y
C
1
4
7
C
9
6
3
EMERGENCY HEAT RELAY
SYSTEMS WITH TWO
OUTDOOR THERMOSTATS
A97052
Fig. 7—24-v Control Circuit Connections
5
Do not vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
1. If equipped with a crankcase heater, energize a minimum of
24 hr before starting unit. To energize heater only, set
thermostat OFF and close electrical disconnect to outdoor
unit.
2. Fully open liquid and vapor service valves.
3. Unit is shipped with valve stem(s) front seated and caps
installed. Replace stem caps after system is opened to refrigerant flow. Replace caps finger tight and tighten additional 1/6
turn using a backup wrench on valve body flats to prevent
distortion of sheet metal.
A00010
Fig. 8—Phase Monitor Control
4. Close electrical disconnects to energize system.
Table 2—Phase Monitor LED Indicators
5. Set room thermostat at desired temperature.
LED
6. Set room thermostat to HEAT or COOL and fan to ON or
AUTO mode, as desired. Operate unit for 15 minutes. Check
system refrigerant charge.
OFF
FLASHING
ON
7. Factory charge is shown on unit rating plate. Adjust charge in
cooling mode by following procedure shown in charging
table. Check charge in heating mode by following procedure
shown on heating check chart. Both are located on unit.
STATUS
No call for compressor
operation
Reversed phase
Normal
Should the temperature continue to fall, R-W2 is made through the
second-stage room thermostat bulb. Circuit R-W2 energizes a
sequencer, bringing on the first bank supplemental electric heat
and providing electrical potential to the second heater sequencer (if
used). If outdoor temperature falls below the setting of the outdoor
thermostat (field-installed option), contacts close to complete the
circuit and bring on the second bank of supplemental electric heat.
• 3-phase scroll compressors are rotation sensitive.
• A flashing LED on phase monitor indicates reverse rotation.
(See Fig. 8 and Table 2.)
• This will not allow contactor to be energized.
• Disconnect power to unit and interchange 2 field wiring
leads on unit contactor.
When the thermostat is satisfied, its contacts open, de-energizing
contactor and sequencer. All heaters and motors should stop.
→ Quiet Shift
SEQUENCE OF OPERATION — With power supplied to indoor
and outdoor units, transformer is energized. Defrost control board
is equipped with 5-minute lockout timer which may be initiated
upon any interruption of power.
Quiet Shift is a field-selectable defrost mode, which will eliminate
occasional noise that could be heard at the start of the defrost cycle
and restarting of heating cycle. It is selected by placing DIP switch
3 (on defrost board) in ON position.
Cooling
When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur. Reversing valve will energize, compressor will turn off for 30 sec, then
turn back on to complete defrost. At the start of heating cycle after
conclusion of defrost mode, reversing valve will de-energize, the
compressor will turn off for another 30 sec, and the fan will turn
off for 40 sec, before starting in the heating mode.
On a call for cooling, the thermostat makes circuits R-O, R-Y, and
R-G. Circuit R-O energizes reversing valve, switching it to cooling
position. On three phase models with scroll compressors, the units
are equipped with a phase monitor to detect if the incoming power
is correctly phased for compressor operation. (See Fig. 8 and Table
2.) If phasing is correct, circuit R-Y energizes contactor, starting
outdoor fan motor and compressor circuit. R-G energizes indoor
unit blower relay, starting indoor blower motor on high speed.
→ Defrost
The defrost control is a time/temperature control which includes a
field-selectable time period (DIP switch 1 and 2 on the board)
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at
90 minutes).
NOTE: If the phasing is incorrect, the contactor will not be
energized. To correct the phasing, interchange any two of the three
power connections on the field side.
When thermostat is satisfied, its contacts open, de-energizing
contactor and blower relay. Compressor and motors stop.
To initiate a forced defrost, two options are available depending on
the status of the defrost thermostat.
NOTE: If indoor unit is equipped with a time-delay relay circuit,
the blower runs an additional 90 sec to increase system efficiency.
If defrost thermostat is closed, speedup pins (J1) must be shorted
by placing a flat head screwdriver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
Heating
On a call for heating, the thermostat makes circuits R-Y and R-G.
If phasing is correct, circuit R-Y energizes contactor, starting
outdoor fan motor and compressor. Circuit R-G energizes indoor
blower relay, starting blower motor on high speed.
6
OF1
DFT
T1
Y
O R W2 Y C
OF2
T2 C C O
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screwdriver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with compressor operation). On return to heating operation, compressor will
again turn off for an additional 30 sec and the fan for 40 sec. When
the Quiet Shift is in OFF position, only a brief 30 sec cycle will be
observed.
P1
120
60
30
ON
QUIET
SHIFT
Speedup
Pins
30
DFT
2. Disconnect outdoor fan motor lead from OF2 on control board
(See Fig. 9.) Tape to prevent grounding.
90
INTERVAL TIMER OFF
P3
1. Turn off power to outdoor unit.
60
J1
SPEEDUP
If it is desirable to observe a complete defrost in warmer weather,
the thermostat must be closed as follows:
CESO130076–00
Quiet
Shift
Defrost interval
DIP switches
A99442
3. Restart unit in heating mode, allowing frost to accumulate on
outdoor coil.
Fig. 9—Defrost Control
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equipment failure, periodic maintenance must be performed on this
equipment.
4. After a few minutes in heating mode, liquid line temperature
should drop below closing point of defrost thermostat (approximately 30°F).
NOTE: Unit will remain in defrost until defrost thermostat
reopens at approximately 80°F coil temperature at liquid line or
remainder of defrost cycle time.
Leave User’s Manual with owner. Explain system operation and
periodic maintenance requirements outlined in manual. Frequency
of maintenance may vary depending upon geographic areas, such
as coastal applications.
5. Turn off power to outdoor and reconnect fan motor lead to
OF2 on control board after above forced defrost cycle.
7
Copyright 2002 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231
38ycxc3si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 003-880
Printed in U.S.A.
Form 38YCX-C3SI
Pg 8
2-02
Replaces: 38YCX-C2SI
Tab 5a 5a
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